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Affiliated Equity (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Affiliate Equity [Line Items]      
Distributions paid to affiliate partners $ 178.6 $ 189.0  
Payments to acquire interest in affiliates 85.1 75.3  
Issuance of interest in affiliates 8.0 $ 3.6  
Other Assets      
Affiliate Equity [Line Items]      
Due from affiliates 13.9   $ 22.9
Other Liabilities      
Affiliate Equity [Line Items]      
Due to affiliates $ 70.7   $ 12.1